Yes, I think you're right. I'm sure there are a lot of atheist LGBTs out there who shy away from openly defending free thought and rationality. Another point I'd like to make is that they are outnumbered by many gay christians who actually hurt the fight for truth and uncompromising justice
Well, as it comes to LGBT-et-cetera, you'll find me under "B" ... and while I don't go spoiling for a fight, I won't shy away from one, either. Most religions I'm aware of want to treat us as undesirables if not abominations, though their holy books fail to provide any rational justification for their positions, other than that their god said so.
Someone had better tell them that two can play that game.